The
<script> tag is used to define a client-side script (JavaScript).The
<script> element either contains scripting statements, or it points to an
external script file through the src attribute.Common uses for JavaScript are
image manipulation, form validation, and dynamic changes of content.To select
an HTML element, JavaScript very often use the document.getElementById(id)
method.This JavaScript example writes "Hello JavaScript!" into an
HTML element with id="demo":
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML =
"Hello JavaScript!";
</script>
</body>
</html>
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